| 摘要 |
<p>A method and apparatus which solve the problem of poor density and definition of an image formed by an ion current (20) projected from an ionographic print head (10), caused by electric field crosstalk between adjacent modulation electrodes (22) in the head (10). By applying a partial modulation voltage (VM') to the adjacent modulation electrodes (22), the density of an individual pixel charge is increased and the pixel charge is "addressed" or deflected to a position on a receptor surface (26) more precisely than the pitch dimension between modulation electrodes (22). A data processor (46) intercepts printing driver commands (44) and constructs therefrom values of partial modulation voltage (VM') by means of an algorithm making deliberate use of the crosstalk phenomenon. The algorithm is pre-defined with respect to image- dependent modulation voltage states and implemented as programmed software or firmware. The partial modulation voltage (VM') is applied to correlated modulation electrodes (22) in response to the printing driver commands (44), by a controller (50) using modified printing commands (48) to produce a corrected image. <IMAGE></p> |
